Bytedance Inc.

Beijing Bytedance Network Technology Co., Ltd.

Microsoft Technology Licensing, LLC

Lemon Inc.

Microsoft Corporation

Bytdance Inc.

Beijing Inc.

Jizheng Xu

Li Feng Zhang

Kai Zhang

Hongbin Liu

Yue Wang

Zhipin Deng

Weijia Zhu

Jian Li

Ye-Kui Wang

Feng Wu

Shipeng Li

Yang Wang

Gary Joseph Sullivan

Hsiao Chiang Chuang

Bin Li

Jiahao Li

Ya-Qin Zhang

Cuiling Lan

Kui Fan

Xiulian Peng

Na Zhang

Li Zhang

Ruiqin Xiong

Lin Luo

Chih-Lung Lin

Lihua Zhu

B Anil Kumar

You Zhou

Sridhar Sankuratri

Zixiang Xiong

Jiexi Wang

Hao Xu

Yuwen He

Jiang Tao Li

Yan Huang

Dongdong Zhang

Yue Li

Li Song

Shiqi Wang

Xiangyang Ji

Keman Yu

Jaehong Chon

Tianliang Fu

Meng Wang

Devices, systems, and methods for digital video coding, which includes matrix-based intra prediction methods for video coding, are described. In a representative aspect, a method for video processing includes performing a conversion between a current video block of a video and a bitstream representation of the current video block using a matrix based intra prediction (MIP) mode in which a prediction block of the current video block is determined by performing, on previously coded samples of the video, a boundary downsampling operation, followed by a matrix vector multiplication operation, and followed by an upsampling operation, where the upsampling operation is performed, in both a vertical direction and a horizontal direction in a fixed order, on samples obtained from the matrix vector multiplication operation.

Matrix-based intra prediction using upsampling

A method for video processing is provided to comprise: determining a motion vector precision of one or more motion vectors related to a current video block of a video; selecting, based on the motion vector precision, a motion vector range; and performing, based on the motion vector range, a conversion between the current video block and a bitstream representation of the video.

Motion vector range based on motion vector precision

Chroma deblocking harmonization for video coding are described. In an exemplary aspect, a method for video processing includes determining, for a conversion between of a first colour component of a current block of a video and a bitstream representation of the first colour component of the current block of the video, one or more deblocking parameters associated with the first colour component involved in a deb locking filter process based on one or more quantization parameters (QP) associated with a second colour component of the current block of the video; and performing the conversion based on the determined deblocking parameters.

Chroma deblocking harmonization for video coding

A method includes determining, for a conversion between a video block of a video and a bitstream of the video, a size of prediction block corresponding to the video block according to a rule. The method also includes performing the conversion based on the determining. The rule specifies that a first size of the prediction block is determined responsive to whether a prediction refinement using optical flow technique is used for coding the video block. The video block has a second size and is coded using an affine merge mode or an affine advanced motion vector prediction mode.

Prediction refinement for affine merge and affine motion vector prediction mode

Methods, systems, and devices for implementing an adaptive color transform (ACT) during image/video encoding and decoding, including: determining, for a conversion between a video including a block and a bitstream of the video, that a size of the block is greater than a maximum allowed size for an ACT mode, and performing, based on the determining, the conversion. In response to the size of the block being greater than the maximum allowed size for the ACT mode, the block is partitioned into multiple sub-blocks. Each of the multiple sub-blocks share a same prediction mode, and the ACT mode is enabled at a sub-block level.

Use of offsets with adaptive colour transform coding tool

Methods and an apparatus for video processing are described. One example method includes determining, for a conversion between a video block of a video and a bitstream of the video, that the video block satisfies a condition. The video block is coded in the bitstream using an intra block copy mode. The method further includes performing the conversion based on the determining. Here, due to the video block satisfying the condition, a portion of an intra block copy buffer is reset during the conversion.

Intra block copy buffer and palette predictor update

A video processing method is described. The method includes determining, for a conversion between a video unit of a video and a coded representation of the video, a maximum number of entries of a palette of representative values used during the conversion according to a rule; and performing the conversion using the palette, and wherein the rule specifies the maximum number of entries according to a characteristic of the video unit.

Palette mode with intra block copy prediction

Devices, systems and methods for digital video coding, which includes deriving RMVF-based motion vector information, are described. An exemplary method for video processing includes deriving at least one motion model for a current video block, based on motion information of at least one non-adjacent spatial neighboring block or at least one temporal neighboring block of the current video block; deriving motion information for the current video block or at least one sub-block of the current video block based on the at least one motion model; and performing a conversion for the current video block based on the derived motion information.

Regression-based motion vector field based sub-block motion vector derivation

A method of video processing includes determining, based on a video characteristic of a first video block, an enabling or disabling of a pruning process for a table updating process; updating one or multiple tables, based on the determination and motion information of the first video block, the one or multiple motion tables being History-based Motion Vector Prediction (HMVP) tables; and performing a conversion between a subsequent video block of the video and bitstream representation of the subsequent video block based on the updated tables.

Pruning method in different prediction mode

A mechanism for processing video data is disclosed. Video decoder initialization information is signaled between an encoder to a decoder. The video decoder initialization information contains a range of initialization parameters. A conversion is performed between a visual media data and a visual media data file based on the range of initialization parameters.

Video decoder initialization information

A method for visual media processing is disclosed. The method includes determining whether a pair of adjacent blocks of visual media data are both intra block copy (IBC) coded and selectively applying, based on the determination, a deblocking filter (DB) process by identifying a boundary at a vertical edge and/or a horizontal edge of the pair of adjacent blocks. The method further includes calculating a boundary strength of a filter, deciding whether to turn on or off the filter, and selecting a strength of the filter in case the filter is turned on. The boundary strength of the filter is dependent on a motion vector difference between motion vectors associated with the pair of adjacent blocks.

Boundary strength determination for deblocking filters in video processing

A method of processing video data is described. The method includes performing a conversion between a current video block of a video and a bitstream of the video. A geometric partitioning mode index for the current video block is coded in the bitstream and a binarization of the geometric partitioning mode index is performed according to a rule. The geometric partitioning mode index specifies a geometric splitting shape of a geometric partitioning mode applied to the current video block. The rule specifies that the geometric partitioning mode index is coded with a fixed-length binarization.

High level syntax for inter prediction with geometric partitioning

A method of digital media processing includes performing a conversion between a media segment and a bitstream of the media segment. The conversion conforming to a format rule and an encryption rule. The format rule specifying that verification information, which includes an indication of an integrity of a portion of the media segment, is signaled in the bitstream.

Indication of digital medial integrity

Devices, systems and methods for coefficient coding in transform skip mode are described. An exemplary method for visual media processing includes: for encoding a current video block in a video region of a visual media data into a bitstream representation of the visual media data, identifying usage of a coding mode and/or an intra prediction mode and/or a set of allowable intra prediction modes; and upon identifying the usage, making a decision of whether to include or exclude, in the bitstream representation, a syntax element indicative of selectively applying a transform skip mode to the current video block, wherein, in the transform skip mode, a residual of a prediction error between the current video block and a reference video block is represented in the bitstream representation of the visual media data without applying a transformation.

Signaling in transform skip mode

Techniques for implementing video processing techniques are described. In one example implementation, a method of video processing includes determining, for a conversion between a current block of a video and a bitstream representation of the video, whether a combined inter and intra prediction (CIIP) coding technique is to be applied to the current block based on a characteristic of the current block. The CIIP coding technique uses an intermedia inter prediction value and an intermedia intra prediction value to derive a final prediction value of the current block. The method also includes performing the conversion based on the determining.

Using combined inter intra prediction in video processing

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San Diego, CA, United States of America

Jizheng Xu